parse.y, vm_eval.c: file encoding in eval

	* parse.y (yycompile): store file name as String to keep the encoding.

	* parse.y (rb_parser_compile_string_path, rb_parser_compile_file_path):
  new functions to pass file name as a String.

	* parse.y (gettable_gen): return a copy of the original file name, not
  a copy in filesystem encoding.

	* vm_eval.c (eval_string_with_cref): use Qundef instead of "(eval)".
	* parse.y (yycompile): store file name as String to keep the encoding.

	* parse.y (rb_parser_compile_string_path, rb_parser_compile_file_path):
	  new functions to pass file name as a String.

	* parse.y (gettable_gen): return a copy of the original file name, not
	  a copy in filesystem encoding.

	* vm_eval.c (eval_string_with_cref): use Qundef instead of "(eval)".


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45473 b2dd03c8-39d4-4d8f-98ff-823fe69b080e